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Rihanna's "777" documentary is headed to DVD.  The star has announced that she'll be releasing a DVD version of the documentary about her week-long world tour last November. 

Fans can purchase it starting May 7th - the day after it makes its world premiere on Fox. 

The documentary will be exactly 77 minutes long, starting just ahead of the debut of Unapologetic, when she performed seven shows in seven countries - in Mexico City, Toronto, Stockholm, Paris, Berlin, London and New York. 

The Fox version of the documentary will be an edited-down 44-minute version.  "777 TOUR" is described as "an inside look at this ambitious and often turbulent tour" with a "larger than life video and audio experience." 

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